TY - JOUR
T1 - Entanglement of nuclear spins in spin-blocked quantum dots
AU - Eto, Mikio
AU - Ashiwa, Takashi
AU - Murata, Mikio
N1 - Funding Information:
The authors gratefully acknowledge discussions with K. Kawamura, R. Fukuda, S. Komiyama, T. Inoshita, A. Shimizu, K. Ono, L.P. Kouwenhoven, G.E.W. Bauer, and S.I. Erlingsson. This work was partially supported by a Grant-in-Aid for Scientific Research in Priority Areas “Semiconductor Nanospintronics” (No. 14076216) of the Ministry of Education, Culture, Sports, Science and Technology, Japan.
PY - 2004/4
Y1 - 2004/4
N2 - We theoretically study unique properties of nuclear spins in quantum dots: an entanglement derived by the spin flip of electrons through hyperfine interaction. The correlation among nuclear spins develops gradually in the presence of the electric current accompanied by the spin flip. This situation is relevant to a leakage current in spin-blocked regions where electrons cannot be transported unless their spins are flipped. The correlated state of nuclear spins drastically enhances the spin-flip rate of electrons and hence the leakage current. By numerical calculations, we show that the enhancement of the current is observable when the residence time of electrons in the quantum dots is shorter than the dephasing time T*2 of nuclear spins.
AB - We theoretically study unique properties of nuclear spins in quantum dots: an entanglement derived by the spin flip of electrons through hyperfine interaction. The correlation among nuclear spins develops gradually in the presence of the electric current accompanied by the spin flip. This situation is relevant to a leakage current in spin-blocked regions where electrons cannot be transported unless their spins are flipped. The correlated state of nuclear spins drastically enhances the spin-flip rate of electrons and hence the leakage current. By numerical calculations, we show that the enhancement of the current is observable when the residence time of electrons in the quantum dots is shorter than the dephasing time T*2 of nuclear spins.
KW - Entanglement
KW - Nuclear spin
KW - Quantum dot
KW - Spin blockade
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U2 - 10.1016/j.physe.2003.12.037
DO - 10.1016/j.physe.2003.12.037
M3 - Conference article
AN - SCOPUS:1842633321
VL - 22
SP - 426
EP - 429
JO - Physica E: Low-Dimensional Systems and Nanostructures
JF - Physica E: Low-Dimensional Systems and Nanostructures
SN - 1386-9477
IS - 1-3
T2 - 15th International Conference on ELectronic Propreties
Y2 - 14 July 2003 through 18 July 2003
ER -